Dental flask



B. A. LEVERING.

(No Model.)

DENTAL FLASK.

No. 497,723. Patented May 16,1893.

UNITED STATES PATENT OEEIcE.

EDWIN A. LEVERING, OF PHILADELPHIA, PENNSYLVANIA.

DENTAL FLASK.

SPECIFICATION forming part of Letters Patent No. 497,723, dated May 16, 1893.

Application filed March 6, 1 8 9 3.

To aZZ whom it may concern..-

Be it known that I, EDWIN A. LEVERING, a citizen of the United States of America, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Dental Flasks, of which the following is aspecification, reference being had therein to the accompanying drawings.

My invention relates to improvements in dental flasks, its object being to provide a self closing and looking flask that can be readily closed and securely looked, that will have no projections on its circumference, one whose cap-plate will be strengthened throughout nearly its whole area by the locking device, and one in which the wear on the locking device can be distributed.

The invention will first be described in con nection with the accompanying drawings, and then pointed out in the claim.

Figure 1 of the drawings is a perspective view of a flask embodying my improvements. Fig. 2 is a vertical sectional view taken th rough the lock-rods. Fig. 3 is a perspective viewof a wrench used in turning the lock-disk.

Referring to the drawings, A is the lower section of the flask, having an integral bottom plate a, and provided with inside vertical tubular projections 1,located opposite each other. Holes for receiving the lower ends of the lockrods are formed in the bottom plate immediately under the tubular projections.

B is the upper section of the flask, also provided with inner vertical tubular projections 2, arranged to register with those in the lower section when the parts are together.

0 is the cap-plate, provided with a central stud or pivot 3; and through this plate, near its outer edge, are formed two diametricallyopposite holes 4-, of the same diameter as that of the tubular projections in the upper and rods are recessed in one side, as at 6, for a purpose hereinafter explained.

E is the loek'disk, whose diameter is but enial No. 464,746. (No model.)

slightly less than that of the cap'platc. At the periphery of this disk are two integral segmental oppositely-inclined rigid cams 7; and in the edge of the disk, at the small end of each cam, is formed a notch 8, whose diameter is slightly greater than that of the lockrods D. From the center of the disk, on the upper side, rises an integral hub 9, adapted to fit neatly over the stud or pivot 3 on the cap-plate, so that it maybe held in proper relation to that plate and also to the lock-rods. Studs 10 project upward from the top of the lock-disk, they being designed to receive a wrench in, such as is shown in Fig. 3, for the purpose of turning said disk. In the meeting edges of the upperand lower sections is formed a pouring spout 11, for use when it is desired to make metal plates.

The manner of assembling the parts and the operation of the locking device will be apparent from the drawings.

It will be noticed that by placing the lockrods inside of the flask I not only give the latter a smooth outersurface,whichis desirable, but I am enabled thereby to make those rods serve to hold the cap-plate in place on the upper section, thereby, through the medium of the stud or pivot and the centering-hub, assuring the proper relation between the segmental cams on the lock-disk and the recesses in the lock-rods. Furthermore by making the lock-plate in the form of a disk nearly cover ing the cap-plate, I am enabled to make the latter very light without danger of its springing or warping while the flask is in use; and by forming the segmental cams rigid and placing them at the edge of the disk, the pressure in looking is exerted equally over the entire area of the cap-plate. Again, by threading the lower ends of the lock-rods and passing them through the bottom of the flask, I am enabled, by means of the nuts, to adjust the rods vertically to any extent desired without turning the recesses out of the path of the cams, whereby any wear on the recessed portions of the rods or on the upper surface of the cams can be readily compensated, and the rods can be made to engage with any portion of the top surface of the cams, so that the Wear on the whole locking device can be distributed.

Having thus described my invention, what the rods project, and a lock-disk having rigid I claim as new, and desire to secure by Letters cams on its upper surface arranged to engage Patent, is with the recesses in the lock-rods, for the pur- In a dental flask, the combination, with the poses set forth. 15 5 upper and lower sections having interior ver- In testimony whereof I affix my signature in tical tubular projections, of lock-rods recessed presence of two witnesses. at iheir upper ends and screw-threaded at their lower ends, said rods located in the tubu- EDWIN A. LEVERING. lar projections, their lower ends passed \Vitnesses: 10 through the bottom plate of the flask and pro- B. B. LISTER,

vided with nuts, a cap-plate through which JOHN MONEILL. 

